package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    //微信登录接口
    public static final String wxLogin = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        String openid = getOpenId(userLoginDTO.getCode());

        //判断OpenId是否为空，如果为空，抛出业务异常
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否为新用户 自动注册
        if (userMapper.getByOpenId(openid) == null){
           User user =  User.builder().openid(openid).createTime(LocalDateTime.now()).build();
           userMapper.insert(user);
            //返回用户对象
            return user;
        }else {
           User user = userMapper.getByOpenId(openid);
            return user;
        }

    }

    private String getOpenId(String code){
        //调用微信服务器接口，获取当前用户OpenId
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(wxLogin,map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        log.info("当前openID：{}",openid);
        return openid;
    }
}
